Split array loads/stores for growable arrays into two IL instructions.

runtime/vm/il_printer.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/il_printer.h"
 
 #include "vm/intermediate_language.h"
 #include "vm/os.h"
 #include "vm/parser.h"
 
@@ skipping 360 matching lines @@
   f->Print("%s", function().ToCString());
   for (intptr_t i = 0; i < ArgumentCount(); ++i) {
     if (i > 0) f->Print(", ");
     ArgumentAt(i)->value()->PrintTo(f);
   }
 }
 
 
 void LoadVMFieldInstr::PrintOperandsTo(BufferFormatter* f) const {
   value()->PrintTo(f);
-  f->Print(", %"Pd"", offset_in_bytes());
+  f->Print(", %"Pd", immutable=%d", offset_in_bytes(), immutable_);
 }
 
 
 void StoreVMFieldInstr::PrintOperandsTo(BufferFormatter* f) const {
   dest()->PrintTo(f);
   f->Print(", %"Pd", ", offset_in_bytes());
   value()->PrintTo(f);
 }
 
 
@@ skipping 409 matching lines @@
       f->Print(" [");
       locations_[i].PrintTo(f);
       f->Print("]");
     }
   }
   f->Print(" }");
   if (outer_ != NULL) outer_->PrintTo(f);
 }
 
 }  // namespace dart